The distance between two points P and Q is d and the length of their projections of PQ on the coordinate planes

### Question Asked by a Student from EXXAMM.com Team

Q 2106412378.     The distance between two points P and Q is d and the
length of their projections of PQ on the coordinate planes
are d_1, d_2, d_3. Then d_(1)^2 + d_(2)^2 + d_(3)^2 = kd^2
, where k is
A

1

B

5

C

3

D

2

#### HINT

(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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